- To list a specific package, you use 
rpm -qa|grep (package)
 - To find out what package a file came from 
rpm -qf /usr/sbin/sshd
 - To show details of a not-yet-installed package 
rpm -qip Singular-release.rpm
 - Find out what the package depends on 
rpm -qR openssh-server
 - Show the files contained in an installed package 
rpm -qi openssh-server
 
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Tips on RPM (Part 1)
Read up on some good tips on  RHEL / Fedora RPM from Linux Format magazine. thought I list it down to use it in the future.